If it was 'super strength' the ground would have shattered, and I am pretty sure it never shattered until ChouChou struck the ground...It was just her putting her body weight on the chain like Xez919 said.
I think there is a big possibility she has it, but she did not display it in this chapter because she never got close to her target.
I could see her cracking his face next chapter if Naruto gives her the chance, possibly while saying her mother's catch phrase like she did in 700. :lol